It is the presence of this gas that necessitates the safety-lamp.
He invented a safety-lamp which alone should have entitled him to the gratitude of posterity.
The fact was unquestionable; and the safety-lamp was undiscovered.
This safety-lamp of the miner not only shows the presence of gas, but prevents its explosion.
But the most picturesque figure was the illustrious inventor of the safety-lamp.
It was a picturesque procession, for every man carried a safety-lamp in one hand and a missile in the other.
The wire cylinder of Saffran's safety-lamp was filled to the very top with a red flame.
Each one had a safety-lamp fastened to his belt and wore a thick felt hat.
For months he investigated and experimented, and at length, in 1815, he constructed what he called the safety-lamp.
Such was Stephenson's theory, when he proceeded to embody his idea of a miner's safety-lamp in a practical form.